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4(15-7c)+8c=20
We move all terms to the left:
4(15-7c)+8c-(20)=0
We add all the numbers together, and all the variables
4(-7c+15)+8c-20=0
We add all the numbers together, and all the variables
8c+4(-7c+15)-20=0
We multiply parentheses
8c-28c+60-20=0
We add all the numbers together, and all the variables
-20c+40=0
We move all terms containing c to the left, all other terms to the right
-20c=-40
c=-40/-20
c=+2
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